Inverse magnetocaloric effect in sol-gel derived nanosized cobalt ferrite

E. Veena Gopalan; I. A. Al-Omari; D. Sakthi Kumar; Yasuhiko Yoshida; P. A. Joy; M. R. Anantharaman

doi:10.1007/s00339-010-5573-8

Inverse magnetocaloric effect in sol-gel derived nanosized cobalt ferrite

E. Veena Gopalan, I. A. Al-Omari, D. Sakthi Kumar, Yasuhiko Yoshida, P. A. Joy, M. R. Anantharaman

Physics

Research output: Contribution to journal › Article › peer-review

58 Citations (Scopus)

Abstract

The magnetocaloric properties of cobalt ferrite nanoparticles were investigated to evaluate the potential of these materials as magnetic refrigerants. Nanosized cobalt ferrites were synthesized by the method of sol-gel combustion. The nanoparticles were found to be spherical with an average crystallite size of 14 nm. The magnetic entropy change (δS_m) calculated indirectly from magnetization isotherms in the temperature region 170-320 K was found to be negative, signifying an inverse magnetocaloric effect in the nanoparticles. The magnitudes of the δS_m values were found to be larger when compared to the reported values in the literature for the corresponding ferrite materials in the nanoregime.

Original language	English
Pages (from-to)	497-503
Number of pages	7
Journal	Applied Physics A: Materials Science and Processing
Volume	99
Issue number	2
DOIs	https://doi.org/10.1007/s00339-010-5573-8
Publication status	Published - May 2010

ASJC Scopus subject areas

Chemistry(all)
Materials Science(all)

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abstract = "The magnetocaloric properties of cobalt ferrite nanoparticles were investigated to evaluate the potential of these materials as magnetic refrigerants. Nanosized cobalt ferrites were synthesized by the method of sol-gel combustion. The nanoparticles were found to be spherical with an average crystallite size of 14 nm. The magnetic entropy change (δSm) calculated indirectly from magnetization isotherms in the temperature region 170-320 K was found to be negative, signifying an inverse magnetocaloric effect in the nanoparticles. The magnitudes of the δSm values were found to be larger when compared to the reported values in the literature for the corresponding ferrite materials in the nanoregime.",

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AU - Gopalan, E. Veena

AU - Al-Omari, I. A.

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AU - Yoshida, Yasuhiko

AU - Joy, P. A.

AU - Anantharaman, M. R.

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N2 - The magnetocaloric properties of cobalt ferrite nanoparticles were investigated to evaluate the potential of these materials as magnetic refrigerants. Nanosized cobalt ferrites were synthesized by the method of sol-gel combustion. The nanoparticles were found to be spherical with an average crystallite size of 14 nm. The magnetic entropy change (δSm) calculated indirectly from magnetization isotherms in the temperature region 170-320 K was found to be negative, signifying an inverse magnetocaloric effect in the nanoparticles. The magnitudes of the δSm values were found to be larger when compared to the reported values in the literature for the corresponding ferrite materials in the nanoregime.

AB - The magnetocaloric properties of cobalt ferrite nanoparticles were investigated to evaluate the potential of these materials as magnetic refrigerants. Nanosized cobalt ferrites were synthesized by the method of sol-gel combustion. The nanoparticles were found to be spherical with an average crystallite size of 14 nm. The magnetic entropy change (δSm) calculated indirectly from magnetization isotherms in the temperature region 170-320 K was found to be negative, signifying an inverse magnetocaloric effect in the nanoparticles. The magnitudes of the δSm values were found to be larger when compared to the reported values in the literature for the corresponding ferrite materials in the nanoregime.

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Inverse magnetocaloric effect in sol-gel derived nanosized cobalt ferrite

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